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Title: Direct observation of nanoparticle-surfactant assembly and jamming at the water-oil interface

Abstract

Electrostatic interactions between nanoparticles (NPs) and functionalized ligands lead to the formation of NP surfactants (NPSs) that assemble at the water-oil interface and form jammed structures. To understand the interfacial behavior of NPSs, it is necessary to understand the mechanism by which the NPSs attach to the interface and how this attachment depends on the areal coverage of the interface. Through direct observation with high spatial and temporal resolution, using laser scanning confocal microscopy and in situ atomic force microscopy (AFM), we observe that early-stage attachment of NPs to the interface is diffusion limited and with increasing areal density of the NPSs, further attachment requires cooperative displacement of the previously assembled NPSs both laterally and vertically. The unprecedented detail provided by in situ AFM reveals the complex mechanism of attachment and the deeply nonequilibrium nature of the assembly.

Authors:
ORCiD logo [1];  [2];  [3]; ORCiD logo [2]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7];  [8]; ORCiD logo [9]; ORCiD logo [10]; ORCiD logo [11]; ORCiD logo [12]; ORCiD logo [11]
  1. The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA., Department of Physics, The City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong, China.
  2. Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA.
  3. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA 94720, USA.
  4. The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
  5. Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720, USA., Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
  6. Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
  7. Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA., Department of Applied Science and Technology, University of California, Berkeley, Berkeley, CA 94720, USA.
  8. Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA., College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation, Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China.
  9. Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, SAR, Hong Kong, China.
  10. Department of Materials Science and Engineering, The City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, SAR, Hong Kong, China.
  11. The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA., Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA.
  12. Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA., Polymer Science and Engineering Department, Conte Center for Polymer Research, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA., Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China., Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba, Sendai 980-8577, Japan.
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
OSTI Identifier:
1724271
Alternate Identifier(s):
OSTI ID: 1798743
Grant/Contract Number:  
KCTR16; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Science Advances
Additional Journal Information:
Journal Name: Science Advances Journal Volume: 6 Journal Issue: 48; Journal ID: ISSN 2375-2548
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Chai, Yu, Hasnain, Jaffar, Bahl, Kushaan, Wong, Matthew, Li, Dong, Geissler, Phillip, Kim, Paul Y., Jiang, Yufeng, Gu, Peiyang, Li, Siqi, Lei, Dangyuan, Helms, Brett A., Russell, Thomas P., and Ashby, Paul D.. Direct observation of nanoparticle-surfactant assembly and jamming at the water-oil interface. United States: N. p., 2020. Web. https://doi.org/10.1126/sciadv.abb8675.
Chai, Yu, Hasnain, Jaffar, Bahl, Kushaan, Wong, Matthew, Li, Dong, Geissler, Phillip, Kim, Paul Y., Jiang, Yufeng, Gu, Peiyang, Li, Siqi, Lei, Dangyuan, Helms, Brett A., Russell, Thomas P., & Ashby, Paul D.. Direct observation of nanoparticle-surfactant assembly and jamming at the water-oil interface. United States. https://doi.org/10.1126/sciadv.abb8675
Chai, Yu, Hasnain, Jaffar, Bahl, Kushaan, Wong, Matthew, Li, Dong, Geissler, Phillip, Kim, Paul Y., Jiang, Yufeng, Gu, Peiyang, Li, Siqi, Lei, Dangyuan, Helms, Brett A., Russell, Thomas P., and Ashby, Paul D.. Fri . "Direct observation of nanoparticle-surfactant assembly and jamming at the water-oil interface". United States. https://doi.org/10.1126/sciadv.abb8675.
@article{osti_1724271,
title = {Direct observation of nanoparticle-surfactant assembly and jamming at the water-oil interface},
author = {Chai, Yu and Hasnain, Jaffar and Bahl, Kushaan and Wong, Matthew and Li, Dong and Geissler, Phillip and Kim, Paul Y. and Jiang, Yufeng and Gu, Peiyang and Li, Siqi and Lei, Dangyuan and Helms, Brett A. and Russell, Thomas P. and Ashby, Paul D.},
abstractNote = {Electrostatic interactions between nanoparticles (NPs) and functionalized ligands lead to the formation of NP surfactants (NPSs) that assemble at the water-oil interface and form jammed structures. To understand the interfacial behavior of NPSs, it is necessary to understand the mechanism by which the NPSs attach to the interface and how this attachment depends on the areal coverage of the interface. Through direct observation with high spatial and temporal resolution, using laser scanning confocal microscopy and in situ atomic force microscopy (AFM), we observe that early-stage attachment of NPs to the interface is diffusion limited and with increasing areal density of the NPSs, further attachment requires cooperative displacement of the previously assembled NPSs both laterally and vertically. The unprecedented detail provided by in situ AFM reveals the complex mechanism of attachment and the deeply nonequilibrium nature of the assembly.},
doi = {10.1126/sciadv.abb8675},
journal = {Science Advances},
number = 48,
volume = 6,
place = {United States},
year = {2020},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1126/sciadv.abb8675

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